As the Israeli Army starts the last stage of its pull-out from Lebanon, settlers on Israel's northern border are again building shelters and bracing themselves for attack. The costly invasion was launched as a quick operation to protect them from PLO attacks across the border. But it has dragged on for three years: over 650 Israeli soldiers and thousands of civilians have died. Hopes that the defeat of the PLO could lead to peace are being undermined by the new threat from militant Shi'ites. Peter Taylor reports from South Lebanon and from Israel on the war which has divided military and political opinion and left an uncertain future.